Mrs. Smith is demonstrating a chemical change for her class. She places 15 grams of baking soda into a beaker. Next she adds 15 grams of vinegar to the same beaker. When the two compounds make contact, they bubble and fizz a great deal. She places the beaker on the balance and notes that the mass of the solution in the beaker is less than the expected 30 grams.
Explain why the mass of the solution in the beaker less than 30 grams.
A) The balance was not working correctly.
B) The gas that was released changed the mass.
C) Mass is always lost in a chemical reaction.
D) The new products have less mass than the original reactants.
Eliminate
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The loss in mass is due to : B) The gas that was released changed the mass.
Explanation:
Mr smith while demonstrating a chemical change noticed the decrease in mass and also noticed the formation of bubbles and fizz when baking soda and vinegar was made to react .
Let us see the reaction first :
NaHCO₃+CH₃COOH --> CH₃COONa + H₂O + CO₂
The bubbles and fizz is due to formation of carbon dioxide gas .
The mass is decreased because some amount of gas is released .Earlier , there was no volatile component .But after reaction the volatile gas is formed that escapes and thus certain mass is lost .
Also , chemical change involves change in mass (when there is a open system ) and the energy changes .
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